A new knee needs movement early, but it also needs respect. The best exercises after knee replacement are not necessarily the hardest ones or the ones that make you sweat. They are the movements that steadily reduce stiffness, rebuild control and help you return to walking, stairs and everyday life without overloading a healing joint.
Your own programme should always take priority. Your surgeon and physiotherapist will consider the type of replacement you have had, your wound healing, swelling, general health and how your knee was functioning before surgery. The guide below explains the exercises commonly used after total or partial knee replacement, and how to judge whether you are progressing at the right pace.
What makes an exercise right after knee replacement?
Early rehabilitation has several jobs: maintaining circulation, helping the knee straighten and bend, waking up the thigh muscles, and restoring confidence with weight-bearing. A little discomfort and muscular effort are expected. Sharp pain, a marked increase in swelling or a knee that feels less capable the next day are signs that the amount may need adjusting.
Consistency matters more than a single ambitious session. Most people do better with short, regular exercise periods spread through the day, alongside planned rest, icing if advised, and keeping the leg elevated to manage swelling. Use your walking aid exactly as instructed. Moving away from crutches or sticks too early can encourage limping, which is harder to correct later.
Best exercises after knee replacement: the early phase
In the first days and weeks, the focus is on circulation, range of movement and muscle activation. Complete the repetitions and frequency set by your clinical team. If they have not given a number, begin gently rather than pushing through fatigue.
Ankle pumps
Lying or sitting with your leg supported, pull your toes towards you, then point them away. This simple movement helps the calf muscles pump blood back towards the heart and can reduce ankle stiffness after time in bed or a chair. It is often one of the first movements patients can perform regularly.
Quadriceps sets
With the leg straight on the bed, tighten the muscles at the front of your thigh by pressing the back of the knee gently down into the mattress. Hold briefly, then relax. Your quadriceps are vital for standing, controlling the knee while walking and managing stairs. It can take time for them to feel fully responsive after surgery, so a weak or unfamiliar sensation early on is common.
Heel slides
Lie on your back or sit with your foot supported on a smooth surface. Slowly slide your heel towards your body to bend the knee, then slide it away again. A strap or towel may help in the early stages, but avoid forcing the bend. The aim is gradual improvement, not a competition with the other leg or with another patient’s recovery.
Supported knee straightening
Place a rolled towel under your ankle or calf, leaving the knee unsupported, and allow the knee to gently straighten. Do not put a cushion directly behind the knee for long periods, as this can encourage it to remain bent. Regaining full or near-full straightening is particularly important for an efficient walking pattern.
Straight-leg raises
Once you can tighten the thigh and keep the knee straight, lift the whole leg a short distance from the bed, then lower with control. If the knee bends or the exercise causes a sharp pull around the wound, return to quadriceps sets and seek advice from your physiotherapist before progressing.
Building strength for everyday movement
As swelling settles and your walking becomes more controlled, rehabilitation usually moves towards functional strengthening. These are the exercises that prepare you for getting up from a chair, using the stairs, shopping and returning to normal routines.
Sit-to-stands
From a firm chair with armrests if needed, place both feet under you, lean forwards slightly and stand using your legs rather than pulling hard with your arms. Sit down slowly and with control. A higher chair is easier at first. This exercise builds thigh and buttock strength in a movement you will use many times each day.
Supported mini-squats
Hold a kitchen worktop or sturdy rail. Bend both knees a small amount while keeping your weight even through both feet, then straighten. Your hips should move backwards as if you are about to sit down. Keep the movement shallow initially and avoid allowing the operated knee to collapse inwards.
Step-ups
When cleared by your physiotherapist, step up onto a low step with the operated leg and bring the other foot up to meet it. Step down slowly. Start with a rail or support nearby. Step-ups closely reflect stair climbing, but they place more demand on the thigh muscles, so they should be introduced only when your basic walking is steady.
Standing hamstring curls and calf raises
Holding support, bend the operated knee to bring the heel backwards, then lower it slowly. For calf raises, rise onto the balls of both feet and lower with control. These exercises help rebuild support around the knee and ankle, which can improve balance and walking confidence.
Walking, cycling and balance work
Walking is one of the most useful parts of recovery, provided it is paced well. Several shorter walks are usually preferable to one long walk that leaves the knee hot, swollen or more painful for the rest of the day. Focus on stepping through the heel and pushing off the toes, rather than hiking the hip or swinging the leg out to the side.
A static exercise bike can be valuable once your knee bends sufficiently and your clinician agrees it is appropriate. Initially, you may need to rock the pedals backwards and forwards rather than completing a full turn. Raise the saddle so the knee is not forced into a deep bend. Resistance should be very light at first – the goal is smooth movement, not a strenuous workout.
Balance work becomes increasingly relevant as you reduce reliance on a stick. Practise standing with equal weight through both legs near a secure support. Later, your physiotherapist may introduce controlled weight shifts, tandem standing or single-leg work. Balance exercises need to match your confidence and safety, particularly if you have dizziness, nerve problems or a history of falls.
How much discomfort is acceptable?
Exercise should feel like work, stretching or mild soreness, particularly around the thigh. The knee may also feel tight because swelling limits movement. Pain that becomes sharp, catches, gives way or continues to climb during an exercise is not a signal to push harder.
Use the 24-hour response as a practical guide. If pain and swelling settle back to your usual level by the following day, the exercise dose was probably reasonable. If the knee remains significantly more swollen, stiff or painful, reduce the repetitions, range or walking distance and discuss it at your next appointment. Progress is rarely perfectly linear. A more active day can cause a temporary setback without meaning that anything is wrong.
Exercises and activities to delay
High-impact activities such as running, jumping and contact sports are not routine early-recovery exercises after knee replacement. Deep squats, twisting under load and kneeling can also be uncomfortable or inappropriate for some patients, especially before the tissues have healed. Whether you can return to activities such as golf, gardening, cycling outdoors or gym training depends on your strength, balance, knee stability and the advice of your surgical team.
Do not copy a programme from a friend who has had a replacement. Age, muscle strength, other joint problems, surgical technique and recovery goals all influence the right plan. A keen walker may need help building endurance; someone who struggled with stairs before surgery may need more focused strength and confidence work.
When to contact your clinical team
Seek urgent medical advice if you develop increasing redness, heat or discharge from the wound, fever, severe calf pain or swelling, chest pain, or shortness of breath. These symptoms need prompt assessment and should not be managed by changing your exercise routine.
Contact your surgeon or physiotherapist if pain is worsening rather than gradually improving, you suddenly lose movement, the knee repeatedly buckles, or swelling prevents you from making expected progress. Early advice can prevent a small issue, such as overdoing activity or developing a poor walking pattern, from becoming a longer-term obstacle.
The most effective recovery plan is one you can repeat calmly and safely. Keep moving little and often, measure progress over weeks rather than days, and let your rehabilitation team tailor the next step to the knee in front of them – yours.